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Table 6:
Parent Unit
199X3P
199X3P
540H
540P
Parent Unit
199X3P
199X3P
199X3P
540H
540H
Easy-Link Unit Number Display and Renumbering Procedure (for 199X3P Models Only)
A. How to display the unit number
Press the "Increase" button on the PCB of a Child unit. The controller of the Child unit will display the assigned number for 10
second. The number can also be accessed through the Diagnostic Mode under Information Mode 32. See Table 7 on page 39.
NOTE:
• The Parent unit is assigned automatically No. 1 in the system and the number isn't displayed on the controller.
• Child units are randomly assigned 2 to 4.
• The system can only link 4 units. Any additional units connected via the Easy-Link wire will be ignored and act
independently of the Easy-Link System.
B. How to reset and reconfigure the numbering of units
Unit #'s can be reset and reassigned manually:
1. Push the ON/OFF button on the controller of the parent unit so the Standby LED turns off.
2. Press and hold the "Increase" button on the PCB of the Parent unit for at least 5 seconds.
3. The green LED on the PCB of the Parent unit will blink for 10 seconds. At the same time the controller of the Child
unit will display "000" for 10 seconds to signify that the computer memory of the previously assigned unit # has been
erased.
4. During the 10 second period press and release the "Increase" button on each Child unit in the new order of your choice.
The new unit numbers will be assigned in this order.
Child Unit (Acceptable Combinations)
199X3P
540H
540H
540H
Child Unit (Unacceptable Combinations)
199X3P
199X3P
199X3P
199X3P
199X3P
On-Demand Water Heater Service Handbook for X3P Models
199X3P
540H
540H
540H
199X3P
540H
540H
540H
199X3P
199X3P
540H
540H
540H
540H
540H
n/a
540H
540H
•
35
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